Police in the United Kingdom are investigating a neo-Nazi group which insists Prince Harry, the grandson of Queen Elizabeth II, should be assassinated because he betrayed the English race by marrying an mixed-race American movie star.

Police said on Thursday that the Sonnenkrieg Division, which is the British offshoot of a violent American neo-Nazi group, was under investigation for the call which had reportedly come as part of a post on the group’s social media page containing a picture from Harry with a gun to his head.

The picture showed Harry, the second son of the heir to the British throne Prince Charles, with his image superimposed on blood and a swastika and captions which read “See ya later, race traitor!”

The police announcement came after the BBC aired a program investigating hundreds of messages sent by extremists on an online gaming server over several months, including messages by key figures in the American neo-Nazi group Atomwaffen Division, Presstv Reported.

“We are aware of the BBC coverage last night around Sonnenkreig Division and enquiries are ongoing,” said a spokesperson for the North East Counter Terrorism Unit.

Harry married Meghan in May against a backdrop of criticisms from fierce pro-monarchy figures that the mixed-race American would not be a good fit for the royals. Recent reports have shown that members of the royal family are unhappy with Meghan as she is not willing to adapt to their lifestyle.

Harry is much more popular than his elder brother William, who has a high chance of ascending to the throne over his father Charles if Queen, now 92, dies or abdicates.

A recent report in the Mail on Sunday said that it was not only Meghan’s manners that had been causing disputes in the royal family but the fact that William had been opposed to her being his brother’s wife and had even discussed the issue with the queen.

Harry and Meghan have decided to leave the Kensington Palace to live in Windsor, outside London, as they expect their first baby in the spring.

Atomwaffen, the American neo-Nazi group which advocates a dystopian ideology, has been linked to five murders in the US. Its name literally means nuclear weapons in German. It celebrates people like Adolf Hitler and Charles Manson while it calls for the overthrow of the US government through the use of terrorism and guerilla warfare.

US authorities believe the group has between 24 to 80 members who have been trained in firearms and hand-to-hand combat.

The Independent newspaper said it believed three people arrested on terrorism charges across England on Thursday were members of Sonnenkreig Division.